Systemd Services 101
Tutorials – Systemd
Take control of the services running on your Linux machine
Systemd is the init system of almost all modern Linux distributions. It's the first process to start when Linux boots up, and it controls everything else that runs on your computer. Much of this happens automatically, and you should never have to think about it, but there are some bits that you may wish to poke around from time to time.
Before we get too far in, the first thing to do is check if you're using systemd. You can do so with the command:
pidof systemd
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